Gauging and setting jig for inside and outside calipers



- Sept. 12, 1950 J. MITCHELL 2,521,934

'GAUGING AND SETTING JIG FOR INSIDE AND OUTSIDE CALIPERS Filed May 15, 1947 John Mitchell 2 2 3 32 3 3 2 9 9 2 7/ I a m 8 0 H 2 I 5 Patented Sept. 12 1950 NITED TA E omens: .4-

i 2, 3 I f ,7

.. GAU'GING AND SETTING J'IG For; ins-ion"- =ANDUTSIDE CALIPEBS V.

john Mit'chell, North Vancouver," I I British Golumbia Canada 4 1 j The present invention relates to structural, functional and appreciable improvements and refinements in what is believed to be a novel jig embodying special means for setting inside and outside calipers.

More specifically, the invention appertains to a precision type jig characterized by co-acting gaging and setting jaws which are adapted to accommodate leg. portions of standard-type inside and outside calipers a structurewhlch, it is submitted, is calculated to fulfill a long felt need, wherever smallwoodworking lathes are used.

In carrying out the pri ciplesof the invention, a simple and expedient jig is provided in which calibrated features make it po ssible to regulate a pair of jawsaccurately in respect to each other,

accommodates a fixed jaw at one end'and in" addition, a shiftable or movable jaw'which is slidable from end to end of the bar.

,Novelty is predicated, inaddition-to the above, onthe shiftableiaw which carries a projectable and retractabl Spindle carrying a releasable and engageable cog, the--cog being connectible with gear 'or rack teeth on the bottom of the bar in order to accomplish fineadjustments of the movable jaw on the one handor to disengage the cog from the teethand to slip the jaw freely for adjustment purposes, this onthe other hand.

Another object of the inyention, thisobiect primarily structural and functional, is to provide a cam detent which is so arranged and carried by the movable jaw as to be engageable with an inclined surface of the bar, whereby to lock frictionally against the bar and to fasten the shiftable jaw in whatever position the user desides it.

Other objects and advantages will become more readily apparent from the following description and the accompanying illustrative drawings.

In the drawings, wherein like numerals are employed to designate like parts throughout the views:

Figure 1 is a side elevational view of a setting and gaging jig constructed in accordance with the invention (the calipers not being shown) Figure 2 is a fragmentary top plan view of the I tion's l 2 of the bar are reduced and screw threaded 1 LTii psiication Mayis, 1947, Serial No.- mini V 's'oiaim's." (cites-143) left-hand end portion of the Jig construction seen in Figure .7

Figures 3 and v4 are transverse vertical sections on the lines 3 -3 and 4-4 .of-F'igure 1, respectivelyyn;

Figure .515 a'jgroup perspective .view of cleats which are provided on the main jaws to accomplishthe desired results in which both inside and outside calipers are employable for setting and gaging-purposes.

Referring now to the drawings by distinguish ing referenceicharacters; the aforementioned horizontal bar is denoted by the numeral 6.-

; clined surface provides a friction locking surface and also ,is .provided with suitably arranged graduationsgzas at 8; I 'In practice; the device is intended to be usedover-a range'between onequarter of an inch' totwelve inches, which is- 1 ordinarily-suflicient for a jigof the type under consideration. Substantially L-shaped brackets are used as stands, one at the left as at 9, the otherat If], these having lateral flanges H attachable told-stationary support. The end por- This is provided with a reduced upstanding par--- tion: 1 6 which may be: conveniently identified as a jaw, and --the upper edge portion thereof is provided with a V-shaped notch or seat H. A relatively thin cleat or blade 18 is fastened as at [9 to the outer surface of the jaw l6 and this cleat is provided with a V-shapednotch or seat 20.

A similar body of block-like form, as indicated at 2| in Figure 4, is slidably mounted on the bar 6 and this has its upper end portion reduced to form a jaw 22, the same having a V-shaped so-called inside seat 23. On the outer side, the face to the right in Figure 1, there is provided another cleat or blade 24 having a V-shaped notch 25 forming an outside seat. The inside seats I! and 23 serve, as a companion pair, to accommodate so-called inside" calipers. .The remaining outside V-seats 20 and 25 serve to accommodate outside calipers.

head or collar 33 on the opposite end 'I -he intere...

mediate portion of this spindle is provided with} cog 34 whose teeth mesh with. rack teeth 33pm;

vided in the aforementioned groove I: Bygrasping' and forcing the spindle or member 3! to'therig'ht, in Figure 1, the cog teeth aresbroughtl-into en; gagement with teeth of the narrow rack35 in order to obtain the necessary clutching anddriving action. A release action 'is attained by simply pulling the knob 32 tothedotted line position shown in Figure 4. Thus, the cog and raok mea'ns may be actuated at will to either. produce a. fine and-,carefully regulated adjustment of thetmovable jaw along the bar, or a free and rapidtad justment, when the cog is disengagedirom .the

rackteeth. a

The. calipers (not -shown).=.fit intolthe .Veseats providedv in the fixed. and! movablenjawst. The. movable jaw is then adjusted, thus spreadingsthe, calipers until an approximate. measurement, is reached, when the geariknobror settingemeansjs. turned. to the exact adjustment with irequislte. finesse. some time, the movable. jaw. islockedbythe latch.- orcamas described. The-closerseatsll and 23. are-for setting of inside calipersland. thafarthen apart ones, and -are for1.-;setting.outside.;, calipers. w 1. I

A. carefulconsideration of-the foregoing deascription in conjunctioniwith theainventioni-as illustrated in the. drawingswill enable thereadon to. obtain a clear understanding and: impression of.-the alleged features ofsmeritandrnoveltyisufiler cient. to clarifythe construction. of? theelnvene. tion as hereinaiterclaimed-l.

Minor changesinshapasize, materials and.=re-.... arrangement of pa11t s.;mayberresortedeto.inane-c tual'; practice so longasnodeparture is made, fromtheinvention as: claimed..;. a

I claim:

1. In a jig construction of.theplassdescnibed,a ati ry f ame, a fixed daw, mounted; on; said. i

If this. measurement! is. toibe used: for.

4 i and outside notches adapted to accommodate inturned terminals of the legs of outside calipers for setting the same.

2. In a jig of the class described, a pair of brackets, a bar supported horizontally between said brackets, a fixed jaw at one end of the bar and adjacent one of said brackets, a slidable aw es i we. and ei tri in cross section and provided alonggone face with graduations forming a scale, the 'shiftable jaw being cooperable with the graduations of said scale, the upper portions of said jaws each being reduced-;-in,thichness disposed in opposed paral- .lelism and-ieach reduced portion formed with a v shaped notch, the notches constituting a pair qi opp o sed seats for leg portions of calipers, and "cleats'secured to the outer faces of'said reduced portions'and alsoprovided with V-shaped notches providingcaliper-leg seats.

"3. In afgaging and setting jig for inside and outside calipers, a pair of brackets rigidly secured on a stationary support, bar supported hetween said bracketsfzi jaw 5 9K fiXedlY mounted on an end DQ I iQD off, v"said bar, saidfjaw block being provided at its top with a reduced extension constituting a fian ge said flange being provided in its upper edge with a' Vfshaped notch, a cleat secured to said 'fiange and-- b ing provided 'in i'ts upper edge with a V s'hapednotch; said-notches} being out of alignment with each other, a s econdj jaw block slidablytrnountedonsaid bar, top portion of said jaw block having a reduced'e g tension providing a ange andsaid-flange being inioppo'sed parallelism tosaid first; flange and in its upper edgea" V shaped nb tclrlineld u ll witih the firs't'named \i-shaped notoh, a cleat nside an o t ide. eal e frame, a relatively movable complemental jam w on said frame, the top portionsofi'saiddaws being, provided with distinguishable-pairs of-.-V,=shap ed notches, inside notches, adapted to accommodate,

outturned terminals of the legs of insidecalipers,

securedto'sa id seeond-'iiange' 'andproviddin its upper edg e with an additional V shaped notch, said nQtc'hes being usable in inner and outer' paired-relationship"for seating leg portions of re pe iv J 9 1 REFERENCES erran Number Name Date aa r-eaves, are of, re ent lama 

